English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/142692
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

Comparison between electrochemical capacitors based on NaOH and KOH activated carbons

AuthorsRoldán Luna, Silvia ; Villar Masetto, Isabel ; Ruiz Ruiz, Vanesa ; Blanco Rodríguez, Clara ; Granda Ferreira, Marcos ; Menéndez López, Rosa María ; Santamaría Ramírez, Ricardo
Chemical activation
Activation temperature
Carbon electrodes
Electrochemical properties
Issue DateMar-2010
PublisherAmerican Chemical Society
CitationEnergy and Fuels 24(6): 3422–3428 (2010)
AbstractThis work describes the chemical activation of a coke using two different activating agents to investigate their behavior as electrodes in supercapacitors. A coke was chemically activated with two hydroxides (KOH and NaOH) under nitrogen flow, at a constant mass hydroxide/coke ratio of 2 and temperatures of 600, 650, and 700 °C. All of the samples were characterized in terms of porosity by N2 sorption at 77 K, surface chemistry by temperature-programmed desorption (TPD), and electrical conductivity. Their electrochemical behavior as electric double-layer capacitors was determined using galvanostatic, voltammetric, and impedance spectroscopy techniques in an aqueous medium with 1 M H2SO4 as the electrolyte. Large differences in capacitive behavior with the increase in the current density were found between the two series of activated samples. The different trends were correlated with the results obtained from the TPD analysis of the CO-type oxygen groups. It was found that these oxygen groups make a positive contribution to capacitance, finding a good correlation between the specific capacitance values, and the amount of these oxygen groups was found for both series.
Publisher version (URL)http://dx.doi.org/10.1021/ef901538m
Appears in Collections:(INCAR) Artículos
Files in This Item:
File Description SizeFormat 
Comparison_electrochemical_Roldan.pdf254,7 kBAdobe PDFThumbnail
Show full item record
Review this work

Related articles:

WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.